The zeroCO2 carbon footprint calculator estimates your business's CO2 emissions in minutes, for your company, a product or an event. No technical know-how needed: instant results on screen and a PDF report by email.
Need a complete Scope 1, 2 and 3 inventory, reviewed by an expert? Explore the PRO Calculator →
A guided process, built for decision-makers who want a credible figure without having to become experts in emissions accounting.How do you calculate a company's carbon footprint?You add up the greenhouse gas emissions generated by the business and convert them into tonnes of CO2 equivalent using standard emission factors (ISPRA, IPCC, Ecoinvent). With zeroCO2's online calculator it takes just a few minutes: enter your consumption in kWh, km or euros spent and get an instant estimate with a min–max range.
Choose what to measure and fill in a guided form. Enter your consumption in kWh, km and m² — or simply in euros spent: the conversion is automatic.
See your estimate in tonnes of CO2eq, with a min–max range and your main emission sources. The PDF report arrives by email.
Pinpoint where to act and choose your path: an in-depth analysis, a consultation with an expert, or offsetting through zeroCO2's reforestation projects.
The questions adapt to your choice.
Pick a path to start the free calculator.What can you calculate with an online CO2 calculator?An online CO2 calculator can estimate emissions for three different areas: a whole company (energy, fleet, employee travel), a single product across its life cycle (materials, production, transport, end of life), or a corporate event (attendees, catering, set-up materials, overnight stays). Each path uses questions and emission factors specific to the chosen context.
Want to understand what gets measured first? Read our guides to the carbon footprint of a company, a product or an event.
The essential definitions to get your bearings before you measure your organisation's carbon footprint.What are Scope 1, 2 and 3 in emissions accounting?They are the three categories of emissions defined by the GHG Protocol, the most widely used international standard. Scope 1 covers direct emissions (boilers, fleet); Scope 2 indirect emissions from purchased energy (electricity); Scope 3 all other indirect emissions across the value chain — often the largest share for service companies.
The total amount of greenhouse gases emitted by an organisation, directly and indirectly, expressed in tonnes of CO2 equivalent (CO2eq) — the unit that makes all greenhouse gases comparable.
LCA is the "cradle-to-grave" methodology that analyses the environmental impact of a product or service, from raw material extraction to end of life.
Requests from customers and supply chains, the CSRD directive, tenders and ESG criteria, avoidable waste: measuring emissions is now part of running an SME.
Direct emissions from sources you control: boilers, fleet, processes.
Indirect emissions from the energy you buy: electricity, district heating.
All other indirect emissions along the value chain.
The free calculator gives you an order of magnitude. The PRO Calculator builds the complete inventory of your emissions — Scope 1, 2 and 3 — has it validated by a zeroCO2 expert and gives you a report with a reduction plan, item by item.
No result is delivered automatically. A zeroCO2 consultant checks your data, sources and emission factors, fixes any inconsistencies and signs off the final report. Plus a walkthrough call to go through the numbers together.
Direct emissions, purchased energy and — above all — your entire value chain: purchases, logistics, waste, services, use and end of life. For many companies Scope 3 is the biggest share: without it, the number doesn't hold up.
More granular calculations and a far more substantial report: every emission source comes with tailored reduction actions, expected impact and priority. A roadmap to put into practice, not a snapshot.
Start with the free estimate. When you need in-depth data and tailored advice, move up to PRO.Free or PRO: which version of the calculator is right for me?The Free version is for a quick, free first estimate, covering Scope 1, 2 and commuting/business travel. The PRO version (€1,500 + VAT) is for when you need a complete Scope 1, 2 and 3 analysis, with data from bills and records, a review by the zeroCO2 team and a tailored report with a reduction roadmap.
ISO certification (14064 / 14067) is not included in either version: it's only available through our tailored consultancy service.
A carbon footprint is the total amount of greenhouse gases — carbon dioxide (CO2), methane, nitrous oxide and others — emitted directly or indirectly by an organisation, a product or an event, expressed in tonnes of CO2 equivalent (CO2eq). The CO2eq unit makes all greenhouse gases comparable by using their global warming potential (GWP). Accounting follows the GHG Protocol, the most widely used international standard for businesses. Measuring your carbon footprint is now an essential step for ESG reporting, the EU's Corporate Sustainability Reporting Directive (CSRD) and requests from your supply chain: our business carbon footprint calculator makes that first step simple.
Yes. The Free version is completely free: no sign-up and no payment details. To send you the estimate and the PDF report, we only ask for your name, company and work email. It's an online carbon footprint calculator built for SMEs that want a first figure without committing to consultancy straight away.
A few minutes. The online CO2 calculator walks you through simple questions on energy, fleet, employee commuting and business travel: no technical expertise needed. Your estimate in tonnes of CO2eq appears on screen straight away, with a breakdown of your main emission sources and a PDF report by email.
No. For each item you can enter the technical figure (kWh, km, m²) or simply the amount spent in euros: the calculator converts it into emissions automatically, using national average prices and up-to-date sector emission factors. One bill or a rough estimate is enough for a reliable indicative result.
The Free version estimates Scope 1 and Scope 2 emissions, plus employee commuting and business travel: the sources that are easiest to gather and that carry real weight. For full Scope 3 accounting (the value chain), there's the PRO version.
A carbon footprint measures the climate-altering emissions of an organisation or activity. An LCA (Life Cycle Assessment, ISO 14040 and 14044) is broader: it assesses all the environmental impacts of a product across its entire life cycle, "from cradle to grave". Our product LCA calculator estimates the carbon footprint along the supply chain (materials, production, transport, end of life); a full multi-category LCA requires our consultancy service.
The Free version gives you an instant, free estimate with a breakdown of your main emission sources and a PDF report. The PRO version (€1,500 + VAT) is an in-depth Scope 1, 2 and 3 analysis, with saved progress, human-in-the-loop review by the zeroCO2 team, a results walkthrough call and a tailored report with a reduction roadmap.
No. Neither the Free nor the PRO version includes ISO certification: they are estimation and analysis tools. Certification (ISO 14064 / 14067) is available only through a tailored consultancy programme with the zeroCO2 team.
The calculation is based on average sector emission factors from recognised public sources: ISPRA (Italy's national emissions inventory), the IPCC (greenhouse gas emission factors) and the Ecoinvent database. The result is always shown as a min–max range with a methodology disclaimer: it's an indicative estimate, not a certified inventory.
It's designed for Italian SMEs (up to around 250 employees involved) and for smaller corporate events. For larger organisations or complex events we recommend a dedicated consultancy programme, because an online LCA and CO2 calculator couldn't guarantee a reliable estimate.
Yes. At the end of the calculation you'll find the option to offset through zeroCO2's high-social-impact reforestation projects. Offsetting doesn't replace reduction, but it's a concrete step for the emissions you can't eliminate yet.
Life Cycle Assessment (LCA) is the methodology that quantifies the environmental impacts of a product or service over its entire existence: raw material extraction, production, distribution, use and end of life (a "cradle-to-grave" approach). It is governed by the international standards ISO 14040 and ISO 14044 and considers multiple impact categories, not just climate. Our product LCA calculator applies this framework in simplified form, estimating the carbon footprint of the supply chain; a full multi-category LCA requires a dedicated consultancy programme.
Scope 1 covers direct emissions from sources the company controls (boiler combustion, company fleet, industrial processes). Scope 2 covers indirect emissions from purchased energy (electricity, district heating, cooling). Scope 3 covers all other indirect emissions across the value chain: purchases, transport, product use, end of life. For many service organisations, Scope 3 is more than 70% of the total (source: GHG Protocol).
Start with the free estimate in a few minutes, or go straight to the full analysis reviewed by an expert.
The calculator's estimates are indicative and based on average sector emission factors from public sources (ISPRA, IPCC, Ecoinvent). They are not a substitute for an emissions inventory certified to ISO standards.